使用 SSH 将文件从 android 应用程序发送到 raspberry pi

Question

我正在尝试通过 WIFI 从 android 应用程序向 RaspberryPi 发送文件。

我可以连接到 RPI 并通过 SSH 向它发送命令。

这是我用来发送 ssh 命令的函数：

public static String executeRemoteCommand(final String username, final String password, final String hostname, final int port, final File file)
            throws Exception {

        JSch jsch = new JSch();
        Session session = jsch.getSession(username, hostname, port);
        session.setPassword(password);

        // Avoid asking for key confirmation
        Properties prop = new Properties();
        prop.put("StrictHostKeyChecking", "no");
        session.setConfig(prop);

        session.connect();

        // SSH Channel
        ChannelExec channelssh = (ChannelExec)
                session.openChannel("exec");
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        channelssh.setOutputStream(baos);

        // Execute command

        channelssh.setCommand("scp " + file + " " + username + "@" + hostname + ":/home/pi/Desktop");
        channelssh.connect();
        try{Thread.sleep(5000);}catch(Exception ee){}
        channelssh.disconnect();
        return baos.toString();
    }

这是要发送的 SSH 命令

scp /storage/emulated/0/Download/201906071017.txt pi@192.168.4.1:/home/pi/Desktop

我在 windows 终端上尝试运行 SSH 命令并成功上传文件

编辑：

我在 .connect() 和 .disconnect() 之间添加了这段代码，以等待我收到命令的响应以断开与 RPi 的连接

        channelssh.setErrStream(System.err);

        InputStream in=channelssh.getInputStream();

        channelssh.connect();

        byte[] tmp=new byte[1024];
        while(true){
            while(in.available()>0){
                int i=in.read(tmp, 0, 1024);
                if(i<0)break;
                System.out.print(new String(tmp, 0, i));
            }
            if(channelssh.isClosed()){
                if(in.available()>0) continue;
                System.out.println("exit-status: "+channelssh.getExitStatus());
                break;
            }
            try{Thread.sleep(1000);}catch(Exception ee){}
        }

        channelssh.disconnect();

现在我的权限在日志中被拒绝，用户名和密码是正确的。

W/System.err: Permission denied, please try again.
W/System.err: Permission denied, please try again.
W/System.err: Permission denied (publickey,password).
W/System.err: lost connection
I/System.out: exit-status: 1

Answer 1

我做到了！！我最终使用 sftp 服务上传文件我正在使用 ChannelSsh 和 ChannelExec。我应该使用 ChannelSftp

这是工作代码

package com.example.a.sitetool;

import android.util.Log;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.Properties;

public class RpiUpdate {


    public static String executeRemoteCommand(final String username, final String password, final String hostname, final int port, final File file)
            throws Exception {

        Log.d("MainActivity", "Entered executeRemoteCommand");

        JSch jsch = new JSch();
        Session session = jsch.getSession(username, hostname, port);
        session.setPassword(password);

        // Avoid asking for key confirmation
        Properties prop = new Properties();
        prop.put("StrictHostKeyChecking", "no");
        session.setConfig(prop);

        session.connect();

        // SSH Channel
        Channel channel = session.openChannel("sftp");
        channel.connect();
        ChannelSftp channelsftp = (ChannelSftp) channel;

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        channelsftp.cd("/home/pi/Desktop");
        channelsftp.put(new FileInputStream(file), file.getName());
        channelsftp.setOutputStream(baos);

        // Execute command
        channelsftp.put(file.getName(),"/home/pi/Desktop");

        InputStream in=channelsftp.getInputStream();

        byte[] tmp=new byte[1024];
        while(true){
            while(in.available()>0){
                int i=in.read(tmp, 0, 1024);
                if(i<0)break;
                System.out.print(new String(tmp, 0, i));
            }
            if(channelsftp.isClosed()){
                if(in.available()>0) continue;
                System.out.println("exit-status: "+channelsftp.getExitStatus());
                break;
            }
            try{Thread.sleep(1000);}catch(Exception ee){}
        }

        channel.disconnect();

        return baos.toString();
    }
}

编辑： 我优化了代码并删除了 ByteArrayOutputStream，因为 Channelsftp 不需要它。此更改导致 return 变为 void 而不是 String 我还添加了更改输出文件权限的功能。

package com.example.a.sitetool;

import android.os.AsyncTask;
import android.os.Environment;
import android.util.Log;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.Session;

import java.io.File;
import java.io.FileInputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Properties;

public class RpiUpdate {
    private static boolean success;


    public static void update() {
        //TODO add online version checking and download
        if (success)
            uploadFile();

    }

    private static void uploadFile() {
        Log.d("RPIUpdate", "Entered upload File");
        success=false;
        new AsyncTask<Integer, Void, Void>() {
            @Override
            protected Void doInBackground(Integer... params) {
                try {
                    executeRemoteCommand("pi", "rbs", "192.168.4.1", 22);
                    Log.d("MainActivity", "File Uploaded");
                    success = true;
                } catch (Exception e) {
                    e.printStackTrace();
                    Log.d("MainActivity", "Failed to upload file");
                    success = false;
                }
                return null;
            }
        }.execute(1);
    }


public static void executeRemoteCommand(final String username, final String password, final String hostname, final int port)
            throws Exception {
        Log.d("RPiUpdate", "Entered executeRemoteCommand");

        //Creating the path on android to bbserver.py
        File root;
        root = new File(Environment.getExternalStorageDirectory() + File.separator + "Download");
        if (!root.exists()) {
            root.mkdirs();
        }
        File file = new File(root, "bbserver.py");

        JSch jsch = new JSch();
        Session session = jsch.getSession(username, hostname, port);
        session.setPassword(password);

        // Avoid asking for key confirmation
        Properties prop = new Properties();
        prop.put("StrictHostKeyChecking", "no");
        session.setConfig(prop);

        session.connect();

        //SFTP setup
        Channel channel = session.openChannel("sftp");
        channel.connect();

        ChannelSftp channelsftp = (ChannelSftp) channel;
        //Renaming the old bbserver.py
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy:MM:dd:HH:mm", Locale.ENGLISH);
        Date now = new Date();
        channelsftp.cd("/home/pi/Desktop");
        // 384 in octal is 600. This makes the file non executable. only readable and writable

        channelsftp.chmod(384, "/home/pi/Desktop/bbserver.py");

        channelsftp.rename("/home/pi/Desktop/bbserver.py", "/home/pi/Desktop/bbserver" + formatter.format(now) + ".py");

        //sending the new bbserver.py file
        channelsftp.put(new FileInputStream(file), file.getName());
        Log.d("RPiUpdate", "Sent file");

        //511 in octal is 777. This gives the file all available permissions(read, write, execute). thus making the file an executable

        channelsftp.chmod(511, "/home/pi/Desktop/" + file.getName());
        Log.d("RPiUpdate", "Changed permissions");

        channel.disconnect();

    }

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